Note 4 - Fair Value Measurements - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Contingent Consideration - Short Term	$ 13,090	$ 0
Contingent Consideration - Long Term	22,320	0
Estimate of Fair Value Measurement [Member]
Contingent Consideration - Short Term	13,090
Contingent Consideration - Long Term	22,320
Total other current and long-term liabilities	35,410
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash equivalents		48,971
Investments		27,480
Contingent Consideration - Short Term	0
Contingent Consideration - Long Term	0
Total other current and long-term liabilities	0
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Contingent Consideration - Short Term	0
Contingent Consideration - Long Term	0
Total other current and long-term liabilities	0
Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Contingent Consideration - Short Term	13,090
Contingent Consideration - Long Term	22,320
Total other current and long-term liabilities	35,410
Reported Value Measurement [Member]
Contingent Consideration - Short Term	0
Contingent Consideration - Long Term	0
Total other current and long-term liabilities	0
Money Market Funds [Member] \| Estimate of Fair Value Measurement [Member]
Cash equivalents	74,522	48,971
Money Market Funds [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Cash equivalents	74,522
Money Market Funds [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Cash equivalents	0	0
Money Market Funds [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Cash equivalents	0	0
Money Market Funds [Member] \| Reported Value Measurement [Member]
Cash equivalents	74,522	48,971
US Treasury Securities [Member] \| Estimate of Fair Value Measurement [Member]
Investments	2,501	27,480
US Treasury Securities [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 1 [Member]
Investments	2,501
US Treasury Securities [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 2 [Member]
Investments	0	0
US Treasury Securities [Member] \| Estimate of Fair Value Measurement [Member] \| Fair Value, Inputs, Level 3 [Member]
Investments	0	0
US Treasury Securities [Member] \| Reported Value Measurement [Member]
Investments	$ 2,524	$ 27,479

Represents the fair value disclosure for cash equivalents as of the balance sheet date.

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Amount of liability recognized arising from contingent consideration in a business combination.

+ References

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-Name Accounting Standards Codification
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-SubTopic 30
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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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